Screen



' M. RRHNOLDS.

ASCREEN. MPLICATION'HLED MAR..21.1919.

zm l Patented MM; 9, i'19120,

l TTQI/VEYQ and a resident of cation, the

AUNITED .l sTATEs PATENT OFFICE.

Mommy PUNsnoN'REYNoLns, or

CLEVELAND HEIGHTS., OHIO,

ATYLER, COMPANY, 0F CLEVELAND, OHIO, A CORPORATION OF OHIO.

scannen'.V

method of strengthening' or increasing the life of woven wire screens which are used in screening machines for grading various materials. A further the provision of an improved screen cloth which will .not be subject to breakage or crystallization of the material along those edges which are held or clamped to the frame of the screening machine.

In such machines the screen cloth is often vibrated continuously 'at high speed, with the result that it is bent backward and forward very rapidly along the line vof its attachment to the sides of the frame, and the inevitable result of this action is to cause the wires of the screen to crystallize at this point, and finally to break. This is particularly noticeable in a screen cloth in which a hard wire is used, as of course the harder the wire the quicker it will crystallize under vibration. To'the accomplishment of the foregoing and related ends. said invention', then, consists of the means hereinafter fully described and particularly pointed out in' the claims.A

The annexed drawing and the following description set forth in detail one'method and one product exemplifying my invention, such disclosed procedure and product constituting however, but one. of various applications of the principles of Vmy invention.

Figure 1 is a transverse section thrpugh a screen cloth showing one method of attachment to a frame; and Fig. 2 is also atransverse section illustrating apparatus which may be used to strengthen the marginal portions of such a screen.

Various means have been tried in an attempt to prevent the lcrystallization and subsequent breakage of the wires of the 'screen at the pointof attachment t9 the frame, but, although this trouble has been a SpecificationA of Letters Patent. Application 'inea march 2.1,

object of the inventionl is removes the results of the 1919` Serial No. 284,185.

the period inwhich woven wire screens have been used, no satisfactory method of pref venting this breakage has heretofore been found.

My improved method of strengthening the. screenalong the marginal. 'portions against crystallization and breakage under vibration involves the softening of the marginal portion of the screen by passing this edge portion only through a heat-treating or annealing furnace in order to soften the wires of the. screen along the edges. At the sameitime care is taken that the remainder of the screen cloth is vnot exposed to the annealingheat and is therefore unaffected by the heat treatment of the marginal portion. The result of this treatment is to very ma- ASSIGNOR T0 THE W. S.

Patented .Man 9, v1920.

continual one in the use of all screens during terially soften, yand hence strengthen under vibration, the edge portions of the screen,

while .preserving the strength and resiliency of the screen cloth proper, nd hence its ability to resist wear of the materials passing thereover and to vibrate freely under impulses imparted to iti The treatment also previous drawing It 1s of course and working of the' wire.

well known that soft wire may be bent backward and forward many more times before breaking than hard wire, and it is this quality of the wires ofthe screen cloth that I make use of in order to lengthen the life of the point of the screen under vibration at attachment to the fra-me. In Fig. 1 of the drawings I have shown a -woven wire `screen l, having its edge portions 2 turned in and tirmly and evenly gripped by a reverselv bent metal strip 3, which isponev means that I have found of securing a uniform grip on the edge of the screen in such-a way as to engage and hold each transverse wire thereof. lhen this screen is vibrated it is bent at approximately' the point indicated by thearrows 4 in Fig. l.

and as the vibrations are extremely rapid, being, never less than several hundred a minuteathe extent of the bendingl action ou the screen willbe readily appreciated. The result of this bending action is of course te crystallizethe wires att'he point of bending, causing the'breakage of these wires in time and the failure of the s'rreen.

In Fig. Q I have shown more'or less diagrammatically an apparatus for treating a screen in the manner described, this appa able fuel, such as gas upon the table 6, with the edge which is to L be softened on the inside,

and is then pushed against the side of the hood 5 below the angle` iron 10, which is spaced a sufficientv distance from the inner edge ofthe table to allow an inch or an inch and a half of the screen to project across above the flame from the burner 7. It is then necessary merely to hold the screen in that position until the edge portion has .been heated and annealed to the desired softness, vv'hichrequires but a very` few minutes in the case of finely Woven screen. The screen is then removed, re versed, and the otheredge treated.

-This improved method of making, or

the screen is of par-v rather strengthening, ticular importance in connectionyvvith that type of screen Which is noW so Widely sold Where tonnage and resistance to Wear are important features. The advantage of the present invention in connection With Wire screen is that it remedies the one remaining chance of failure of the screen, which is the breakage that occurs along the margin of the screen Where it is'held in the frame, due to the vibration or banding of this part. AerI tual use of this type of screen, accordance With my improved method, has shown an average increase in the life of the screen which is very material and Which decreases the cost of the screening material' and greatly increases the value and life of the individual screens. This improved method softens and renders more iexible the edge portions of the screen, Where it is gripped or attached to the frame Without in any Way affecting the character of the remainder or body portion of the screen, which' retains its resilience and resistance to Wear that has brought it into such common use.

Other forms may be employed embodying the features of my invention instead of the vone here explained, change being made inV the form or construction, provided the elements stated by any of the following claims or the equivalent of such stated elements be employed, whether produced by my preferred method or by others embodying steps equivalent to those stated in the following claims. I therefore particularly point out and distinctly claim as my invention v 1. A Woven Wire screen cloth comprising a relatively hard resilient screen body provided with softened marginal portions.

2. A Woven Wire screen cloth comprising a relatively hard resilient screen body provided vvith annealed marginal portions.

Signed by me this 19th day of March, 1919.

vMORLEY PUNSHON REYNOLDS.

constructed in 

